Single-pulse-switched multiple energy X-ray source applications
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a single-pulse, multiple-energy technology, applied in the direction of instruments, machines/engines, and handling using diaphragms/collimeters, etc., can solve the problem of ambient radiation levels in excess of acceptable standards
Inactive Publication Date: 2009-05-26
AMERICAN SCI & ENG INC
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However, a container of dense material may still shield the characteristic x-rays emitted by such material from detection.
However, this approach implicates the duration and flux of the x-ray pulse and may result in ambient levels of radiation in excess of acceptable standards.
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[0023]This invention takes advantage of the fact that the spectra of x-rays generated by accelerating electrons into a target, as provided by individual or multiple linear accelerators (“linacs”), may be tailored to cover distinct energy ranges. Use of such distinct spectra, as produced by a linac having a Shaped Energy™ option (see U.S. Pat. No. 6,459,761, “Spectrally Shaped X-Ray Inspection System,” issuing Oct. 1, 2002, hereby incorporated by reference) may allow for material identification within dense cargo while holding leakage dose rates to cabinet level specifications. A security system may also include backscatter recognition capability for organic recognition, as described, for example, in U.S. Pat. No. 5,313,511.
[0024]With a higher end of the linac energy range above a threshold of 7-10 MeV so as to be adequate for generating sufficient photo-neutron flux, reliable fissile material recognition capability may be provided by neutron detectors, even if the fissile material i...
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Abstract
An x-ray inspection system for identifying fissile material includes one or more sources of penetrating radiation that generate first, second, and third instantaneous spectra where the object is exposed to the second only if there is no penetration of the first and the object is exposed to the third only if there is no penetration of the second. Further, the source of the second and the third spectra is a source adapted to provide single pulses. Consequently, ambient levels of radiation may be held below cabinet levels while identifying objects containing fissile material.
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CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation-in-part of U.S. Ser. No. 10 / 957,770, concurrently abandoned, which is a continuation-in-part of a U.S. patent application with Ser. No. 10 / 750,178, itself a continuation-in-part application of a U.S. patent application Ser. No. 09 / 818,987, filed Mar. 27, 2001, claiming priority from U.S. Provisional Application Ser. No. 60 / 192,425, filed Mar. 28, 2000. The immediate parent of the present application, U.S. Ser. No. 10 / 957,770, is also a continuation-in-part application of U.S. patent application with Ser. No. 10 / 156,989, filed May 29, 2002, which claims priority from a U.S. Provisional Application with Ser. No. 60 / 360,854, filed Mar. 1, 2002, as well as a continuation-in-part of U.S. patent application Ser. No. 10 / 161,037, which is a continuation-in-part of U.S. patent application with Ser. No. 09 / 919,352, filed Jul. 30, 2001 which is a continuation-in-part of U.S. patent application with Ser. No. ...
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Patent Type & Authority Patents(United States)
IPC IPC(8): G01F23/00
CPCG01V5/0091
Inventor MISHIN, ANDREY V.SAPP, JR., WILLIAM WADEROTHSCHILD, PETER
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